CONTENTS 



Henderson, L. J., Fenn, W. O., and Cohn, Edwin J. Influence of 



electrolytes upon the viscosity of dough 387 



Irwin, Marian. Comparative studies on respiration. VI. Increased 



production of carbon dioxide accompanied by decrease of acidity. 399 



Osterhout, W. J. V. Decrease of permeability and antagonistic 



effects caused by bile salts 405 



Osterhout, W. J. V. A comparison of permeability in plant and 

 animal cells 409 



Harvey, E. Newton. The relation between the oxygen concentra- 

 tion and rate of reduction of methylene blue by milk 415 



Itano, Arao, and Neill, James. Influence of temperature and 

 hydrogen ion concentration upon the spore cycle of Bacillus 

 suhtilis 421 



Hackh, Ingo W. D. Bioelements; the chemical elements of Hving 

 matter 429 



Patten, Bradley M. Photoreactions of partially blinded whip- 

 tail scorpions 435 



Henderson, L. J., Cohn, Edwin J., Cathcart, P, H., Wachman, 

 J. D., and Fenn, W. O. A study of the action of acid and alkali 

 on gluten 459 



Uhlenhuth, Eduard. Relation between thyroid gland, meta- 

 morphosis, and growth 473 



Loeb, Jacques. Amphoteric colloids. IV. The influence of the 

 valency of cations upon the physical properties of gelatin 483 



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